Cutline 3-Column - Trouble Changing Default Header Images (1 post)

Hi there,
Right now I'm using the Cutline 3-column theme, but I can't figure out - even after reading the tutorial - how to change the header images to my own photos. I've saved my own photo in the content/themes/header/images file and uploaded to my blog host via FTP, but it's still reverting back to the default image. Anyone know what I might be doing wrong?
Thanks very much,
Liz